This is the Palazzo Mastai Ferretti located in the resort town of Senigallia, on the Adriatic Sea. Blessed Pius IX was born in this town in this palace. Today there is a nice museum here dedicated to the Pontiff from Marche (the name of the region).
A good day to visit Senigallia is on February 7, the liturgical feast of B. Pius IX. We made the trip on that day a couple of years ago and enjoyed a very spiritual pilgrimage.